DE1244617B - Exchange pen - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

B 43 k

German class: 70 a - 3/10

Number: 1244 617

File number: N 21146 VII b / 70 a

Filing date: February 1, 1962

Opened on: July 13, 1967

The invention relates to an interchangeable pen in which several leads with lead carriers and return springs are mounted longitudinally displaceably in a holding sleeve located inside a jacket sleeve, the mine carriers being assigned return springs which are attached to an attachment sleeve at the end of the jacket sleeve are attached.

There are known interchangeable pens in which a tubular at the rear part of the jacket sleeve Insert piece is inserted with an externally attached, pressed-out or attached cam, which engages in a corresponding recess in the jacket sleeve. The one behind the cam recess Part of the jacket sleeve is smooth on the inner wall, so that when inserting the insert great difficulties can arise because the jacket sleeve initially through the cam must be greatly expanded. If the insertion of the insert into the jacket sleeve fails, so it is difficult to pull the insert back out of the jacket sleeve without damage, so that the jacket sleeve or the insert is usually unusable in this case. This can be done with the known Solution may be avoided by arranging slots in the insert, however these slots are expensive to manufacture, and the stability of the insert is reduced will.

The invention is based on the object of providing an interchangeable pen of the type described at the beginning to create in which the neck sleeve can be inserted easily and without the risk of damage leaves and after the insertion a firm hold of the neck sleeve on the jacket sleeve is guaranteed.

In the case of an exchangeable pen with several leads with lead carriers and return springs in one are mounted longitudinally displaceably within a casing sleeve, the lead carriers Return springs are assigned, which are attached to the end of the jacket sleeve in a neck sleeve, is according to the invention at the rear end of the jacket sleeve an outwardly directed elevation, for example in the form of an expression, present, seen in the arial direction in front of this expression In the non-bulged wall of the jacket sleeve a recess is provided into which a after The shape and size of corresponding cams engages on the attachment sleeve in a manner known per se. Through this the extension piece is secured against twisting during insertion because it is in the Expression is performed. In addition, the extension piece can be changed despite the protruding over its circumference pen

Applicant:

Walter Nagele, Schwäbisch Gmünd, Goethestr. 59

Named as inventor:

Walter Nagele, Schwäbisch Gmünd

Slightly insert the cam, as the jacket sleeve does not expand elastically in the first part of the insertion path has to be or the extension piece does not have to be elastically compressed. Only on that short, not bulged piece of the jacket sleeve between the elongated expression and the recess a slightly larger pressure must be used to lock the extension piece. With a very simple design of the interchangeable pen, this has the advantage in terms of manufacturing that in each case the cam fits into the recess.

According to a further feature of the invention, the extension sleeve has a taper at its rear end on, which is provided with a thread for the end cap, so that a simple and secure attachment of the end cap on the extension piece is guaranteed.

In a further embodiment of the invention, preferably on the rear part of the attachment sleeve, Longitudinal groove-like depressions evenly distributed over the circumference are provided for hanging the fastening hooks for the return springs. Through this the return springs are secure against the adapter sleeve with a simple design of the interchangeable pen fixed, which in turn is attached to the jacket sleeve in a torsion-proof manner.

The clip of the pen can be changed in a simple manner against rotation with respect to the jacket sleeve be secured when a tab provided on the clip into the expression of the jacket sleeve intervenes.

The object of the invention is illustrated in the drawing using an exemplary embodiment.

Fi g. 1 is a longitudinal section through one according to the invention trained pen;

F i g. 2 is a view of the jacket sleeve;

F i g. 3 is a partial view of the neck sleeve.

709 610/10

i 244

The interchangeable pen according to FIG. 1 has a known Way on a jacket sleeve 1, in which the holding sleeve 2 is mounted in the middle and front part is, within which the lead carriers 3 lie, the webs 4 of which extend through slots 5 of the holding sleeve. The ends of the mine carriers are firmly connected to the return springs 6, their free ends Wear hooks 7, which are used to attach the return springs at the end of the pen pen.

The expression 8 of the jacket sleeve seen at the rear end 1 'of the jacket sleeve 1 is held in such a way that that the cam or approach 9 of the neck sleeve 10 when inserting this neck sleeve 10 into the Jacket sleeve 1 has an axial guide that prevents twisting of the attachment sleeve during insertion and so a safe and quick locking of the cam 9 into the recess provided for its fixing 11 of the jacket sleeve 1 allows. By engaging the cam 9 of the attachment sleeve 10 in the Recess 11 of the jacket sleeve 1 is the neck sleeve against rotation when shifting to the jacket sleeve set. Thus, according to a further feature of the invention, the attachment sleeve can also be used as Support of the end cap of the interchangeable pen are formed, and it is also a Perfect storage of the return springs in the jacket sleeve is achieved. The neck sleeve is accordingly 10 provided with a thread 12 onto which the upper end cap is screwed.

To set the hooks of the return springs immovable in the neck sleeve 10, are still in the Neck sleeve 10 axially directed grooves 13 are provided, which are preferably uniformly corresponding over the circumference the number of return springs are distributed. This causes the thread in the jacket sleeve, the was previously common to attach the previously common Head screw, which was the carrier of the end cap, superfluous. The one provided in the jacket sleeve Expression 8 is also designed so that it also represents a clip lock against rotation. For this purpose, on the underside of the ring attached to the clip 14 is a slightly protruding downward Flap 15 arranged, which engages in the expression 8 and finds a fixed position there. The clip is clearly defined with respect to the jacket sleeve and secured against twisting.

The attachment sleeve 10 can be designed as a drawn part. It can be round or square, with the angular training represents a certain anti-twist protection, since then a mutual mobility of the the same-sided casing sleeve and the neck sleeve is avoided.

Claims (4)

Patent claims: 1. Exchange pen, in which several leads with lead carriers and return springs in one are mounted longitudinally displaceably within a casing sleeve, wherein the Mine carriers are assigned return springs, which are at the end of the jacket sleeve in a neck sleeve are attached, characterized in that at the rear end of the jacket sleeve (1) a outwardly directed elevation (8), for example in the form of an expression, is present and, seen in the axial direction, in front of this expression (8) in the non-bulged wall the jacket sleeve (1) is provided with a recess (11) into which a shape and size corresponding cam (9) engages on the neck sleeve (10) in a manner known per se. 2. Exchange pen according to claim 1, characterized in that the neck sleeve (10) at its rear end has a taper with a thread (12) for the end cap is provided. 3. Exchange pen according to claims 1 and 2, characterized in that on the neck sleeve (10), preferably in its rear part, evenly distributed over the circumference Longitudinal groove-like recesses (13) for hanging in the fastening hooks (7) for the return springs are provided. 4. Exchange pen according to claims 1 to 3, characterized in that one on the clip (14) provided tab (15) in the expression (8) of the jacket sleeve for the purpose of forming an anti-twist device intervenes Considered publications:
German patents No. 618 946, 838 574,
413. 1 sheet of drawings 709 610/10 7.67 © Bundesdruckerei Berlin